The problem described hereafter exists only if you are using the Android-Standard-Browser to access this Forum. If you are using an alternative application then you are not affected. Examples for alternative applications are Chrome, Firefox, Opera, Tapatalk.
As some members have noted, there is a problem with Standard-Browser on Android. During the writing of a new post or a reply everything works fine as long as you keep typing at the end of your text. But if the text is scrolled up then it can happen that the last line(s) of your text become unreachable. If this happens for you then press "Save Draft" (the disk icon above the text box) to secure your inputs and follow the "Solution" part.
On Android use an alternative application instead of the Standard-Browser to access the TreeBuzz Forum (e.g. Chrome, Firefox, Opera, Tapatalk, etc.).